M41ST87WMX6TR STMicroelectronics, M41ST87WMX6TR Datasheet - Page 36

• Manufacturer Part Number: M41ST87WMX6TR
• Description: IC SUPERVISOR RTC 160X8 28-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Supervisorr

Specifications of M41ST87WMX6TR

• Memory Size: 160B
• Time Format: HH:MM:SS:hh (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC, 28-SOH (8.48mm Width)
• Bus Type: Serial (2-Wire, I2C)
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 2.7V
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 28
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6457-2; M41ST87WMX6TR

Clock operation
3.9
3.10
36/48
t
V
Figure 25. RSTIN1 & RSTIN2 timing waveforms
Table 10.
1. Valid for ambient operating temperature: T
2. Pulse widths of less than 100 ns will result in no RESET (for noise immunity).
3. Programmable (see
Power-fail comparators (1 and 2)
Two power-fail inputs (PFI
If either PFI
output (PFO
detector to signal a failing power supply. Typically PFI
external voltage dividers (see
available) or the regulated output of the V
such that the voltage at PFI
regulated V
operating voltage.
During battery back-up, the power-fail comparator turns off and PFO
remain) low. This occurs after V
PFO
from V
comparator is enabled and PFO
unused, PFI
unconnected.
Power-fail outputs
The PFO
full-CMOS output drivers. By setting the power-fail output open drain bit (PFOD) to a '1,' the
R2
CC
noted).
will not generate a reset condition. RSTIN1 and RSTIN2 are each internally pulled up to
Symbol
2
through a 100 k resistor.
t
t
t
R1
R2
rec
are forced high, irrespective of V
PFD
(2)
(2)
(3)
RSTIN1
RSTIN2
RST
1
(max) until the inputs are recognized. At the end of this time, the power-fail
and PFO
CC
1
1
1
Reset AC characteristics
or PFI
or PFI
or PFO
input to the M41ST87Y/W or the microprocessor drops below the minimum
RSTIN1 low to RST low (min pulse width)
RSTIN2 low to RSTIN2 high (min pulse width)
RSTIN1 or RSTIN2 high to RST high
2
Table 12 on page
2
2
is less than the power-fail threshold (V
2
outputs are programmable as N-channel, open drain output drivers, or
should be connected to V
) will go low. This function is intended for use as an under-voltage
tR1
1
and PFI
1
or PFI
Figure 4 on page
CC
1
Parameter
and PFO
39). Same function as power-on reset.
2
drops below V
2
) are compared to an internal reference voltage (1.25V).
A
falls below V
= –40 to 85°C; V
PFI
CC
for the write protect time (t
2
(1)
follow PFI
trec
regulator. The voltage divider can be set up
SS
10) to either the unregulated DC input (if it is
PFD
Hi-Z
PFI
tR2
and the associated PFO
CC
(min). When power returns, PFO
several milliseconds before the
1
= 4.5 to 5.5 V or 2.7 to 3.6 V (except where
1
and PFI
and PFI
PFI
), the associated power-fail
2
trec
2
are connected through
. If the comparator is
Min
100
100
96
M41ST87Y, M41ST87W
1
rec
and PFO
), which is the time
1
Hi-Z
or PFO
98
Max
AI07072
200
200
2
(3)
go (or
2
left
1
Unit
ms
ns
ns
and